Free-standing gauge



FIG. 1 is a front elevation view of the free-standing gauge;

FIG. 2 is a rear elevation view of the free-standing gauge;

FIG. 3 is a perspective view of the free-standing gauge;

FIG. 4 is a top view of the free-standing gauge;

FIG. 5 is a left elevation view of the free-standing gauge; and,

FIG. 6 is a bottom view of the free-standing gauge.

The broken line showing is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a free-standing gauge, as shown and described. 